Ahead of a planned UnCarrier event later this week rumored to focus on business customers, T-Mobile has announced that prepaid customers on the carrier’s Simple Choice Prepaid plan slate with 3GB of data or higher will be able to take advantage of the Data Stash rolling data feature beginning this coming Sunday March 22nd.

The feature will be added automatically to qualifying accounts and no customer intervention will be needed. As with the postpaid version launched in January, Data Stash on Simple Choice allows customers to rollover unused monthly data for a year with 10GB of data provided by the carrier to qualifying accounts.